Github user sardell commented on the issue:
https://github.com/apache/metron/pull/1096
@nickwallen @tiborm Sorry for the ongoing nature of this PR, but I've made
two small but important updates:
* The first has to do with rxjs import statements that weren't updated
automatically via the [rxjs-tslint auto update
command](https://github.com/ReactiveX/rxjs-tslint). This command was supposed
to resolve all import statements and is recommended for upgrading by the rxjs
team, but when I was reviewing a piece of code in the PR today, I noticed an
old import statement. As a result, I went through manually and made sure all
rxjs imports and operators were updated.
* The second update is related to [this
bug](https://github.com/angular/angular/issues/25424), which led to an
@angular/core patch release yesterday. As a result, I ran `ng update
@angular/core` and resolved the issue.
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